The attorneys for convicted murderer Drew Peterson said there's no doubt the case will be heard on appeal, calling it a "dark day in America" when someone can be convicted on hearsay evidence.

"They passed a law to get this individual. Do you really think that somebody can take on the government and win in a case like this? It's almost impossible," said attorney Joe Lopez.

With no physical evidence tying Peterson to the death of his third wife, Kathleen Savio, prosecutors had to rely on hearsay and circumstantial evidence. Such testimony isn't usually admissible in court, but Illinois legislators in 2008 passed a law -- dubbed "Drew's Law" -- which allows it in rare circumstances.

"There's going to be an appeal. Believe me, there's several world-class appellate lawyers just waiting to get their teeth into this," said defense attorney Joel Brodksy.

But if Will County State's Attorney James Glasgow felt threatened he'd ultimately lose the case on appeal, he didn't let on.